GCC 4.2.0 release C++ standard library and runtime support code.

1 files changed, 643 insertions, 528 deletions

diff --git a/contrib/libstdc++/include/std/std_bitset.h b/contrib/libstdc++/include/std/std_bitset.h
index 01e3f90..860e775 100644
--- a/contrib/libstdc++/include/std/std_bitset.h
+++ b/contrib/libstdc++/include/std/std_bitset.h
@@ -1,6 +1,7 @@
 // <bitset> -*- C++ -*-
 
-// Copyright (C) 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
+// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006
+// Free Software Foundation, Inc.
 //
 // This file is part of the GNU ISO C++ Library.  This library is free
 // software; you can redistribute it and/or modify it under the
@@ -15,7 +16,7 @@
 
 // You should have received a copy of the GNU General Public License along
 // with this library; see the file COPYING.  If not, write to the Free
-// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
 // USA.
 
 // As a special exception, you may use this file as part of a free software
@@ -40,9 +41,8 @@
  * purpose.  It is provided "as is" without express or implied warranty.
  */
 
-/** @file bitset
- *  This is a Standard C++ Library header.  You should @c #include this header
- *  in your programs, rather than any of the "st[dl]_*.h" implementation files.
+/** @file include/bitset
+ *  This is a Standard C++ Library header.
  */
 
 #ifndef _GLIBCXX_BITSET
@@ -61,10 +61,11 @@
 
 #define _GLIBCXX_BITSET_BITS_PER_WORD  numeric_limits<unsigned long>::digits
 #define _GLIBCXX_BITSET_WORDS(__n) \
- ((__n) < 1 ? 0 : ((__n) + _GLIBCXX_BITSET_BITS_PER_WORD - 1)/_GLIBCXX_BITSET_BITS_PER_WORD)
+ ((__n) < 1 ? 0 : ((__n) + _GLIBCXX_BITSET_BITS_PER_WORD - 1) \
+                  / _GLIBCXX_BITSET_BITS_PER_WORD)
+
+_GLIBCXX_BEGIN_NESTED_NAMESPACE(std, _GLIBCXX_STD)
 
-namespace _GLIBCXX_STD
-{
   /**
    *  @if maint
    *  Base class, general case.  It is a class inveriant that _Nw will be
@@ -81,7 +82,9 @@ namespace _GLIBCXX_STD
       /// 0 is the least significant word.
       _WordT 		_M_w[_Nw];
 
-      _Base_bitset() { _M_do_reset(); }
+      _Base_bitset()
+      { _M_do_reset(); }
+
       _Base_bitset(unsigned long __val)
       {
 	_M_do_reset();
@@ -113,10 +116,12 @@ namespace _GLIBCXX_STD
       { return _M_w[_S_whichword(__pos)]; }
 
       _WordT&
-      _M_hiword() { return _M_w[_Nw - 1]; }
+      _M_hiword()
+      { return _M_w[_Nw - 1]; }
 
       _WordT
-      _M_hiword() const { return _M_w[_Nw - 1]; }
+      _M_hiword() const
+      { return _M_w[_Nw - 1]; }
 
       void
       _M_do_and(const _Base_bitset<_Nw>& __x)
@@ -160,7 +165,8 @@ namespace _GLIBCXX_STD
       }
 
       void
-      _M_do_reset() { memset(_M_w, 0, _Nw * sizeof(_WordT)); }
+      _M_do_reset()
+      { std::memset(_M_w, 0, _Nw * sizeof(_WordT)); }
 
       bool
       _M_is_equal(const _Base_bitset<_Nw>& __x) const
@@ -220,10 +226,11 @@ namespace _GLIBCXX_STD
 	      _M_w[__n] = _M_w[__n - __wshift];
 	  else
 	    {
-	      const size_t __sub_offset = _GLIBCXX_BITSET_BITS_PER_WORD - __offset;
+	      const size_t __sub_offset = (_GLIBCXX_BITSET_BITS_PER_WORD 
+					   - __offset);
 	      for (size_t __n = _Nw - 1; __n > __wshift; --__n)
-		_M_w[__n] = (_M_w[__n - __wshift] << __offset) |
-		  (_M_w[__n - __wshift - 1] >> __sub_offset);
+		_M_w[__n] = ((_M_w[__n - __wshift] << __offset)
+			     | (_M_w[__n - __wshift - 1] >> __sub_offset));
 	      _M_w[__wshift] = _M_w[0] << __offset;
 	    }
 
@@ -246,10 +253,11 @@ namespace _GLIBCXX_STD
 	      _M_w[__n] = _M_w[__n + __wshift];
 	  else
 	    {
-	      const size_t __sub_offset = _GLIBCXX_BITSET_BITS_PER_WORD - __offset;
+	      const size_t __sub_offset = (_GLIBCXX_BITSET_BITS_PER_WORD
+					   - __offset);
 	      for (size_t __n = 0; __n < __limit; ++__n)
-		_M_w[__n] = (_M_w[__n + __wshift] >> __offset) |
-		  (_M_w[__n + __wshift + 1] << __sub_offset);
+		_M_w[__n] = ((_M_w[__n + __wshift] >> __offset)
+			     | (_M_w[__n + __wshift + 1] << __sub_offset));
 	      _M_w[__limit] = _M_w[_Nw-1] >> __offset;
 	    }
 	  
@@ -275,8 +283,8 @@ namespace _GLIBCXX_STD
 	{
 	  _WordT __thisword = _M_w[__i];
 	  if (__thisword != static_cast<_WordT>(0))
-	    return __i * _GLIBCXX_BITSET_BITS_PER_WORD
-	      + __builtin_ctzl(__thisword);
+	    return (__i * _GLIBCXX_BITSET_BITS_PER_WORD
+		    + __builtin_ctzl(__thisword));
 	}
       // not found, so return an indication of failure.
       return __not_found;
@@ -301,23 +309,22 @@ namespace _GLIBCXX_STD
       __thisword &= (~static_cast<_WordT>(0)) << _S_whichbit(__prev);
 
       if (__thisword != static_cast<_WordT>(0))
-	return __i * _GLIBCXX_BITSET_BITS_PER_WORD
-	  + __builtin_ctzl(__thisword);
+	return (__i * _GLIBCXX_BITSET_BITS_PER_WORD
+		+ __builtin_ctzl(__thisword));
 
       // check subsequent words
       __i++;
-      for ( ; __i < _Nw; __i++ )
+      for (; __i < _Nw; __i++)
 	{
 	  __thisword = _M_w[__i];
 	  if (__thisword != static_cast<_WordT>(0))
-	    return __i * _GLIBCXX_BITSET_BITS_PER_WORD
-	      + __builtin_ctzl(__thisword);
+	    return (__i * _GLIBCXX_BITSET_BITS_PER_WORD
+		    + __builtin_ctzl(__thisword));
 	}
       // not found, so return an indication of failure.
       return __not_found;
     } // end _M_do_find_next
 
-
   /**
    *  @if maint
    *  Base class, specialization for a single word.
@@ -331,8 +338,13 @@ namespace _GLIBCXX_STD
       typedef unsigned long _WordT;
       _WordT _M_w;
 
-      _Base_bitset( void ) : _M_w(0) {}
-      _Base_bitset(unsigned long __val) : _M_w(__val) {}
+      _Base_bitset(void)
+      : _M_w(0)
+      { }
+
+      _Base_bitset(unsigned long __val)
+      : _M_w(__val)
+      { }
 
       static size_t
       _S_whichword(size_t __pos )
@@ -351,53 +363,68 @@ namespace _GLIBCXX_STD
       { return (static_cast<_WordT>(1)) << _S_whichbit(__pos); }
 
       _WordT&
-      _M_getword(size_t) { return _M_w; }
+      _M_getword(size_t)
+      { return _M_w; }
 
       _WordT
-      _M_getword(size_t) const { return _M_w; }
+      _M_getword(size_t) const
+      { return _M_w; }
 
       _WordT&
-      _M_hiword() { return _M_w; }
+      _M_hiword()
+      { return _M_w; }
 
       _WordT
-      _M_hiword() const { return _M_w; }
+      _M_hiword() const
+      { return _M_w; }
 
       void
-      _M_do_and(const _Base_bitset<1>& __x) { _M_w &= __x._M_w; }
+      _M_do_and(const _Base_bitset<1>& __x)
+      { _M_w &= __x._M_w; }
 
       void
-      _M_do_or(const _Base_bitset<1>& __x)  { _M_w |= __x._M_w; }
+      _M_do_or(const _Base_bitset<1>& __x)
+      { _M_w |= __x._M_w; }
 
       void
-      _M_do_xor(const _Base_bitset<1>& __x) { _M_w ^= __x._M_w; }
+      _M_do_xor(const _Base_bitset<1>& __x)
+      { _M_w ^= __x._M_w; }
 
       void
-      _M_do_left_shift(size_t __shift) { _M_w <<= __shift; }
+      _M_do_left_shift(size_t __shift)
+      { _M_w <<= __shift; }
 
       void
-      _M_do_right_shift(size_t __shift) { _M_w >>= __shift; }
+      _M_do_right_shift(size_t __shift)
+      { _M_w >>= __shift; }
 
       void
-      _M_do_flip() { _M_w = ~_M_w; }
+      _M_do_flip()
+      { _M_w = ~_M_w; }
 
       void
-      _M_do_set() { _M_w = ~static_cast<_WordT>(0); }
+      _M_do_set()
+      { _M_w = ~static_cast<_WordT>(0); }
 
       void
-      _M_do_reset() { _M_w = 0; }
+      _M_do_reset()
+      { _M_w = 0; }
 
       bool
       _M_is_equal(const _Base_bitset<1>& __x) const
       { return _M_w == __x._M_w; }
 
       bool
-      _M_is_any() const { return _M_w != 0; }
+      _M_is_any() const
+      { return _M_w != 0; }
 
       size_t
-      _M_do_count() const { return __builtin_popcountl(_M_w); }
+      _M_do_count() const
+      { return __builtin_popcountl(_M_w); }
 
       unsigned long
-      _M_do_to_ulong() const { return _M_w; }
+      _M_do_to_ulong() const
+      { return _M_w; }
 
       size_t
       _M_do_find_first(size_t __not_found) const
@@ -424,7 +451,6 @@ namespace _GLIBCXX_STD
       }
     };
 
-
   /**
    *  @if maint
    *  Base class, specialization for no storage (zero-length %bitset).
@@ -437,8 +463,11 @@ namespace _GLIBCXX_STD
     {
       typedef unsigned long _WordT;
 
-      _Base_bitset() {}
-      _Base_bitset(unsigned long) {}
+      _Base_bitset()
+      { }
+
+      _Base_bitset(unsigned long)
+      { }
 
       static size_t
       _S_whichword(size_t __pos )
@@ -471,54 +500,69 @@ namespace _GLIBCXX_STD
       }
 
       _WordT
-      _M_hiword() const { return 0; }
+      _M_hiword() const
+      { return 0; }
 
       void
-      _M_do_and(const _Base_bitset<0>&) { }
+      _M_do_and(const _Base_bitset<0>&)
+      { }
 
       void
-      _M_do_or(const _Base_bitset<0>&)  { }
+      _M_do_or(const _Base_bitset<0>&)
+      { }
 
       void
-      _M_do_xor(const _Base_bitset<0>&) { }
+      _M_do_xor(const _Base_bitset<0>&)
+      { }
 
       void
-      _M_do_left_shift(size_t) { }
+      _M_do_left_shift(size_t)
+      { }
 
       void
-      _M_do_right_shift(size_t) { }
+      _M_do_right_shift(size_t)
+      { }
 
       void
-      _M_do_flip() { }
+      _M_do_flip()
+      { }
 
       void
-      _M_do_set() { }
+      _M_do_set()
+      { }
 
       void
-      _M_do_reset() { }
+      _M_do_reset()
+      { }
 
       // Are all empty bitsets equal to each other?  Are they equal to
       // themselves?  How to compare a thing which has no state?  What is
       // the sound of one zero-length bitset clapping?
       bool
-      _M_is_equal(const _Base_bitset<0>&) const { return true; }
+      _M_is_equal(const _Base_bitset<0>&) const
+      { return true; }
 
       bool
-      _M_is_any() const { return false; }
+      _M_is_any() const
+      { return false; }
 
       size_t
-      _M_do_count() const { return 0; }
+      _M_do_count() const
+      { return 0; }
 
       unsigned long
-      _M_do_to_ulong() const { return 0; }
+      _M_do_to_ulong() const
+      { return 0; }
 
       // Normally "not found" is the size, but that could also be
       // misinterpreted as an index in this corner case.  Oh well.
       size_t
-      _M_do_find_first(size_t) const { return 0; }
+      _M_do_find_first(size_t) const
+      { return 0; }
 
       size_t
-      _M_do_find_next(size_t, size_t) const { return 0; }
+      _M_do_find_next(size_t, size_t) const
+      { return 0; }
     };
 
 
@@ -532,8 +576,7 @@ namespace _GLIBCXX_STD
 
   template<>
     struct _Sanitize<0>
-    { static void _S_do_sanitize(unsigned long) { } };
-
+    { static void _S_do_sanitize(unsigned long) {} };
 
   /**
    *  @brief  The %bitset class represents a @e fixed-size sequence of bits.
@@ -600,508 +643,540 @@ namespace _GLIBCXX_STD
    *  @endif
   */
   template<size_t _Nb>
-    class bitset : private _Base_bitset<_GLIBCXX_BITSET_WORDS(_Nb)>
-  {
-  private:
-    typedef _Base_bitset<_GLIBCXX_BITSET_WORDS(_Nb)> _Base;
-    typedef unsigned long _WordT;
-
-    void
-    _M_do_sanitize()
+    class bitset
+    : private _Base_bitset<_GLIBCXX_BITSET_WORDS(_Nb)>
     {
-      _Sanitize<_Nb%_GLIBCXX_BITSET_BITS_PER_WORD>::
-          _S_do_sanitize(this->_M_hiword());
-    }
+    private:
+      typedef _Base_bitset<_GLIBCXX_BITSET_WORDS(_Nb)> _Base;
+      typedef unsigned long _WordT;
 
-  public:
-    /**
-     *  This encapsulates the concept of a single bit.  An instance of this
-     *  class is a proxy for an actual bit; this way the individual bit
-     *  operations are done as faster word-size bitwise instructions.
-     *
-     *  Most users will never need to use this class directly; conversions
-     *  to and from bool are automatic and should be transparent.  Overloaded
-     *  operators help to preserve the illusion.
-     *
-     *  (On a typical system, this "bit %reference" is 64 times the size of
-     *  an actual bit.  Ha.)
-    */
-    class reference
-    {
-      friend class bitset;
+      void
+	_M_do_sanitize()
+	{
+	  _Sanitize<_Nb % _GLIBCXX_BITSET_BITS_PER_WORD>::
+	    _S_do_sanitize(this->_M_hiword());
+	}
+
+    public:
+      /**
+       *  This encapsulates the concept of a single bit.  An instance of this
+       *  class is a proxy for an actual bit; this way the individual bit
+       *  operations are done as faster word-size bitwise instructions.
+       *
+       *  Most users will never need to use this class directly; conversions
+       *  to and from bool are automatic and should be transparent.  Overloaded
+       *  operators help to preserve the illusion.
+       *
+       *  (On a typical system, this "bit %reference" is 64 times the size of
+       *  an actual bit.  Ha.)
+       */
+      class reference
+      {
+	friend class bitset;
+
+	_WordT *_M_wp;
+	size_t _M_bpos;
+	
+	// left undefined
+	reference();
+	
+      public:
+	reference(bitset& __b, size_t __pos)
+	{
+	  _M_wp = &__b._M_getword(__pos);
+	  _M_bpos = _Base::_S_whichbit(__pos);
+	}
 
-      _WordT *_M_wp;
-      size_t _M_bpos;
+	~reference()
+	{ }
 
-      // left undefined
-      reference();
+	// For b[i] = __x;
+	reference&
+	operator=(bool __x)
+	{
+	  if (__x)
+	    *_M_wp |= _Base::_S_maskbit(_M_bpos);
+	  else
+	    *_M_wp &= ~_Base::_S_maskbit(_M_bpos);
+	  return *this;
+	}
 
-    public:
-      reference(bitset& __b, size_t __pos)
+	// For b[i] = b[__j];
+	reference&
+	operator=(const reference& __j)
+	{
+	  if ((*(__j._M_wp) & _Base::_S_maskbit(__j._M_bpos)))
+	    *_M_wp |= _Base::_S_maskbit(_M_bpos);
+	  else
+	    *_M_wp &= ~_Base::_S_maskbit(_M_bpos);
+	  return *this;
+	}
+
+	// Flips the bit
+	bool
+	operator~() const
+	{ return (*(_M_wp) & _Base::_S_maskbit(_M_bpos)) == 0; }
+
+	// For __x = b[i];
+	operator bool() const
+	{ return (*(_M_wp) & _Base::_S_maskbit(_M_bpos)) != 0; }
+
+	// For b[i].flip();
+	reference&
+	flip()
+	{
+	  *_M_wp ^= _Base::_S_maskbit(_M_bpos);
+	  return *this;
+	}
+      };
+      friend class reference;
+
+      // 23.3.5.1 constructors:
+      /// All bits set to zero.
+      bitset()
+      { }
+
+      /// Initial bits bitwise-copied from a single word (others set to zero).
+      bitset(unsigned long __val)
+      : _Base(__val)
+      { _M_do_sanitize(); }
+
+      /**
+       *  @brief  Use a subset of a string.
+       *  @param  s  A string of '0' and '1' characters.
+       *  @param  position  Index of the first character in @a s to use;
+       *                    defaults to zero.
+       *  @throw  std::out_of_range  If @a pos is bigger the size of @a s.
+       *  @throw  std::invalid_argument  If a character appears in the string
+       *                                 which is neither '0' nor '1'.
+       */
+      template<class _CharT, class _Traits, class _Alloc>
+	explicit
+	bitset(const std::basic_string<_CharT, _Traits, _Alloc>& __s,
+	       size_t __position = 0)
+	: _Base()
+	{
+	  if (__position > __s.size())
+	    __throw_out_of_range(__N("bitset::bitset initial position "
+				     "not valid"));
+	  _M_copy_from_string(__s, __position,
+			      std::basic_string<_CharT, _Traits, _Alloc>::npos);
+	}
+
+      /**
+       *  @brief  Use a subset of a string.
+       *  @param  s  A string of '0' and '1' characters.
+       *  @param  position  Index of the first character in @a s to use.
+       *  @param  n    The number of characters to copy.
+       *  @throw  std::out_of_range  If @a pos is bigger the size of @a s.
+       *  @throw  std::invalid_argument  If a character appears in the string
+       *                                 which is neither '0' nor '1'.
+       */
+      template<class _CharT, class _Traits, class _Alloc>
+	bitset(const std::basic_string<_CharT, _Traits, _Alloc>& __s,
+	       size_t __position, size_t __n)
+	: _Base()
+	{
+	  if (__position > __s.size())
+	    __throw_out_of_range(__N("bitset::bitset initial position "
+				     "not valid"));
+	  _M_copy_from_string(__s, __position, __n);
+	}
+      
+      // 23.3.5.2 bitset operations:
+      //@{
+      /**
+       *  @brief  Operations on bitsets.
+       *  @param  rhs  A same-sized bitset.
+       *
+       *  These should be self-explanatory.
+       */
+      bitset<_Nb>&
+      operator&=(const bitset<_Nb>& __rhs)
       {
-	_M_wp = &__b._M_getword(__pos);
-	_M_bpos = _Base::_S_whichbit(__pos);
+	this->_M_do_and(__rhs);
+	return *this;
       }
 
-      ~reference() { }
+      bitset<_Nb>&
+      operator|=(const bitset<_Nb>& __rhs)
+      {
+	this->_M_do_or(__rhs);
+	return *this;
+      }
 
-      // For b[i] = __x;
-      reference&
-      operator=(bool __x)
+      bitset<_Nb>&
+      operator^=(const bitset<_Nb>& __rhs)
+      {
+	this->_M_do_xor(__rhs);
+	return *this;
+      }
+      //@}
+      
+      //@{
+      /**
+       *  @brief  Operations on bitsets.
+       *  @param  position  The number of places to shift.
+       *
+       *  These should be self-explanatory.
+       */
+      bitset<_Nb>&
+      operator<<=(size_t __position)
       {
-	if ( __x )
-	  *_M_wp |= _Base::_S_maskbit(_M_bpos);
+	if (__builtin_expect(__position < _Nb, 1))
+	  {
+	    this->_M_do_left_shift(__position);
+	    this->_M_do_sanitize();
+	  }
 	else
-	  *_M_wp &= ~_Base::_S_maskbit(_M_bpos);
+	  this->_M_do_reset();
 	return *this;
       }
 
-      // For b[i] = b[__j];
-      reference&
-      operator=(const reference& __j)
+      bitset<_Nb>&
+      operator>>=(size_t __position)
       {
-	if ( (*(__j._M_wp) & _Base::_S_maskbit(__j._M_bpos)) )
-	  *_M_wp |= _Base::_S_maskbit(_M_bpos);
+	if (__builtin_expect(__position < _Nb, 1))
+	  {
+	    this->_M_do_right_shift(__position);
+	    this->_M_do_sanitize();
+	  }
 	else
-	  *_M_wp &= ~_Base::_S_maskbit(_M_bpos);
+	  this->_M_do_reset();
+	return *this;
+      }
+      //@}
+      
+      //@{
+      /**
+       *  These versions of single-bit set, reset, flip, and test are
+       *  extensions from the SGI version.  They do no range checking.
+       *  @ingroup SGIextensions
+       */
+      bitset<_Nb>&
+      _Unchecked_set(size_t __pos)
+      {
+	this->_M_getword(__pos) |= _Base::_S_maskbit(__pos);
 	return *this;
       }
 
-      // Flips the bit
-      bool
-      operator~() const
-      { return (*(_M_wp) & _Base::_S_maskbit(_M_bpos)) == 0; }
-
-      // For __x = b[i];
-      operator bool() const
-      { return (*(_M_wp) & _Base::_S_maskbit(_M_bpos)) != 0; }
-
-      // For b[i].flip();
-      reference&
-      flip()
+      bitset<_Nb>&
+      _Unchecked_set(size_t __pos, int __val)
       {
-	*_M_wp ^= _Base::_S_maskbit(_M_bpos);
+	if (__val)
+	  this->_M_getword(__pos) |= _Base::_S_maskbit(__pos);
+	else
+	  this->_M_getword(__pos) &= ~_Base::_S_maskbit(__pos);
 	return *this;
       }
-    };
-    friend class reference;
-
-    // 23.3.5.1 constructors:
-    /// All bits set to zero.
-    bitset() { }
-
-    /// Initial bits bitwise-copied from a single word (others set to zero).
-    bitset(unsigned long __val) : _Base(__val)
-    { _M_do_sanitize(); }
-
-    /**
-     *  @brief  Use a subset of a string.
-     *  @param  s  A string of '0' and '1' characters.
-     *  @param  position  Index of the first character in @a s to use; defaults
-     *               to zero.
-     *  @throw  std::out_of_range  If @a pos is bigger the size of @a s.
-     *  @throw  std::invalid_argument  If a character appears in the string
-     *                                 which is neither '0' nor '1'.
-    */
-    template<class _CharT, class _Traits, class _Alloc>
-      explicit bitset(const basic_string<_CharT, _Traits, _Alloc>& __s,
-		      size_t __position = 0) : _Base()
+
+      bitset<_Nb>&
+      _Unchecked_reset(size_t __pos)
       {
-	if (__position > __s.size())
-	  __throw_out_of_range(__N("bitset::bitset initial position "
-				   "not valid"));
-	_M_copy_from_string(__s, __position,
-			    basic_string<_CharT, _Traits, _Alloc>::npos);
+	this->_M_getword(__pos) &= ~_Base::_S_maskbit(__pos);
+	return *this;
       }
 
-    /**
-     *  @brief  Use a subset of a string.
-     *  @param  s  A string of '0' and '1' characters.
-     *  @param  position  Index of the first character in @a s to use.
-     *  @param  n    The number of characters to copy.
-     *  @throw  std::out_of_range  If @a pos is bigger the size of @a s.
-     *  @throw  std::invalid_argument  If a character appears in the string
-     *                                 which is neither '0' nor '1'.
-    */
-    template<class _CharT, class _Traits, class _Alloc>
-      bitset(const basic_string<_CharT, _Traits, _Alloc>& __s,
-	     size_t __position, size_t __n) : _Base()
+      bitset<_Nb>&
+      _Unchecked_flip(size_t __pos)
       {
-	if (__position > __s.size())
-	 __throw_out_of_range(__N("bitset::bitset initial position "
-				  "not valid"));
-	_M_copy_from_string(__s, __position, __n);
+	this->_M_getword(__pos) ^= _Base::_S_maskbit(__pos);
+	return *this;
       }
 
-    // 23.3.5.2 bitset operations:
-    //@{
-    /**
-     *  @brief  Operations on bitsets.
-     *  @param  rhs  A same-sized bitset.
-     *
-     *  These should be self-explanatory.
-    */
-    bitset<_Nb>&
-    operator&=(const bitset<_Nb>& __rhs)
-    {
-      this->_M_do_and(__rhs);
-      return *this;
-    }
+      bool
+      _Unchecked_test(size_t __pos) const
+      { return ((this->_M_getword(__pos) & _Base::_S_maskbit(__pos))
+		!= static_cast<_WordT>(0)); }
+      //@}
+      
+      // Set, reset, and flip.
+      /**
+       *  @brief Sets every bit to true.
+       */
+      bitset<_Nb>&
+      set()
+      {
+	this->_M_do_set();
+	this->_M_do_sanitize();
+	return *this;
+      }
 
-    bitset<_Nb>&
-    operator|=(const bitset<_Nb>& __rhs)
-    {
-      this->_M_do_or(__rhs);
-      return *this;
-    }
+      /**
+       *  @brief Sets a given bit to a particular value.
+       *  @param  position  The index of the bit.
+       *  @param  val  Either true or false, defaults to true.
+       *  @throw  std::out_of_range  If @a pos is bigger the size of the %set.
+       */
+      bitset<_Nb>&
+      set(size_t __position, bool __val = true)
+      {
+	if (__position >= _Nb)
+	  __throw_out_of_range(__N("bitset::set"));
+	return _Unchecked_set(__position, __val);
+      }
 
-    bitset<_Nb>&
-    operator^=(const bitset<_Nb>& __rhs)
-    {
-      this->_M_do_xor(__rhs);
-      return *this;
-    }
-    //@}
-
-    //@{
-    /**
-     *  @brief  Operations on bitsets.
-     *  @param  position  The number of places to shift.
-     *
-     *  These should be self-explanatory.
-    */
-    bitset<_Nb>&
-    operator<<=(size_t __position)
-    {
-      if (__builtin_expect(__position < _Nb, 1))
-        {
-          this->_M_do_left_shift(__position);
-          this->_M_do_sanitize();
-        }
-      else
+      /**
+       *  @brief Sets every bit to false.
+       */
+      bitset<_Nb>&
+      reset()
+      {
 	this->_M_do_reset();
-      return *this;
-    }
+	return *this;
+      }
 
-    bitset<_Nb>&
-    operator>>=(size_t __position)
-    {
-      if (__builtin_expect(__position < _Nb, 1))
-        {
-          this->_M_do_right_shift(__position);
-          this->_M_do_sanitize();
-        }
-      else
-	this->_M_do_reset();
-      return *this;
-    }
-    //@}
-
-    //@{
-    /**
-     *  These versions of single-bit set, reset, flip, and test are
-     *  extensions from the SGI version.  They do no range checking.
-     *  @ingroup SGIextensions
-    */
-    bitset<_Nb>&
-    _Unchecked_set(size_t __pos)
-    {
-      this->_M_getword(__pos) |= _Base::_S_maskbit(__pos);
-      return *this;
-    }
+      /**
+       *  @brief Sets a given bit to false.
+       *  @param  position  The index of the bit.
+       *  @throw  std::out_of_range  If @a pos is bigger the size of the %set.
+       *
+       *  Same as writing @c set(pos,false).
+       */
+      bitset<_Nb>&
+      reset(size_t __position)
+      {
+	if (__position >= _Nb)
+	  __throw_out_of_range(__N("bitset::reset"));
+	return _Unchecked_reset(__position);
+      }
+      
+      /**
+       *  @brief Toggles every bit to its opposite value.
+       */
+      bitset<_Nb>&
+      flip()
+      {
+	this->_M_do_flip();
+	this->_M_do_sanitize();
+	return *this;
+      }
 
-    bitset<_Nb>&
-    _Unchecked_set(size_t __pos, int __val)
-    {
-      if (__val)
-	this->_M_getword(__pos) |= _Base::_S_maskbit(__pos);
-      else
-	this->_M_getword(__pos) &= ~_Base::_S_maskbit(__pos);
-      return *this;
-    }
+      /**
+       *  @brief Toggles a given bit to its opposite value.
+       *  @param  position  The index of the bit.
+       *  @throw  std::out_of_range  If @a pos is bigger the size of the %set.
+       */
+      bitset<_Nb>&
+      flip(size_t __position)
+      {
+	if (__position >= _Nb)
+	  __throw_out_of_range(__N("bitset::flip"));
+	return _Unchecked_flip(__position);
+      }
+      
+      /// See the no-argument flip().
+      bitset<_Nb>
+      operator~() const
+      { return bitset<_Nb>(*this).flip(); }
+
+      //@{
+      /**
+       *  @brief  Array-indexing support.
+       *  @param  position  Index into the %bitset.
+       *  @return  A bool for a 'const %bitset'.  For non-const bitsets, an
+       *           instance of the reference proxy class.
+       *  @note  These operators do no range checking and throw no exceptions,
+       *         as required by DR 11 to the standard.
+       *
+       *  @if maint
+       *  _GLIBCXX_RESOLVE_LIB_DEFECTS Note that this implementation already
+       *  resolves DR 11 (items 1 and 2), but does not do the range-checking
+       *  required by that DR's resolution.  -pme
+       *  The DR has since been changed:  range-checking is a precondition
+       *  (users' responsibility), and these functions must not throw.  -pme
+       *  @endif
+       */
+      reference
+      operator[](size_t __position)
+      { return reference(*this,__position); }
 
-    bitset<_Nb>&
-    _Unchecked_reset(size_t __pos)
-    {
-      this->_M_getword(__pos) &= ~_Base::_S_maskbit(__pos);
-      return *this;
-    }
+      bool
+      operator[](size_t __position) const
+      { return _Unchecked_test(__position); }
+      //@}
+      
+      /**
+       *  @brief Retuns a numerical interpretation of the %bitset.
+       *  @return  The integral equivalent of the bits.
+       *  @throw  std::overflow_error  If there are too many bits to be
+       *                               represented in an @c unsigned @c long.
+       */
+      unsigned long
+      to_ulong() const
+      { return this->_M_do_to_ulong(); }
+
+      /**
+       *  @brief Retuns a character interpretation of the %bitset.
+       *  @return  The string equivalent of the bits.
+       *
+       *  Note the ordering of the bits:  decreasing character positions
+       *  correspond to increasing bit positions (see the main class notes for
+       *  an example).
+       */
+      template<class _CharT, class _Traits, class _Alloc>
+	std::basic_string<_CharT, _Traits, _Alloc>
+	to_string() const
+	{
+	  std::basic_string<_CharT, _Traits, _Alloc> __result;
+	  _M_copy_to_string(__result);
+	  return __result;
+	}
 
-    bitset<_Nb>&
-    _Unchecked_flip(size_t __pos)
-    {
-      this->_M_getword(__pos) ^= _Base::_S_maskbit(__pos);
-      return *this;
-    }
+      // _GLIBCXX_RESOLVE_LIB_DEFECTS
+      // 434. bitset::to_string() hard to use.
+      template<class _CharT, class _Traits>
+	std::basic_string<_CharT, _Traits, std::allocator<_CharT> >
+	to_string() const
+	{ return to_string<_CharT, _Traits, std::allocator<_CharT> >(); }
+
+      template<class _CharT>
+	std::basic_string<_CharT, std::char_traits<_CharT>,
+	                  std::allocator<_CharT> >
+	to_string() const
+	{
+	  return to_string<_CharT, std::char_traits<_CharT>,
+	                   std::allocator<_CharT> >();
+	}
 
-    bool
-    _Unchecked_test(size_t __pos) const
-    {
-      return (this->_M_getword(__pos) & _Base::_S_maskbit(__pos))
-	!= static_cast<_WordT>(0);
-    }
-    //@}
-
-    // Set, reset, and flip.
-    /**
-     *  @brief Sets every bit to true.
-    */
-    bitset<_Nb>&
-    set()
-    {
-      this->_M_do_set();
-      this->_M_do_sanitize();
-      return *this;
-    }
+      std::basic_string<char, std::char_traits<char>, std::allocator<char> >
+      to_string() const
+      {
+	return to_string<char, std::char_traits<char>,
+	                 std::allocator<char> >();
+      }
 
-    /**
-     *  @brief Sets a given bit to a particular value.
-     *  @param  position  The index of the bit.
-     *  @param  val  Either true or false, defaults to true.
-     *  @throw  std::out_of_range  If @a pos is bigger the size of the %set.
-    */
-    bitset<_Nb>&
-    set(size_t __position, bool __val = true)
-    {
-      if (__position >= _Nb)
-	__throw_out_of_range(__N("bitset::set"));
-      return _Unchecked_set(__position, __val);
-    }
+      // Helper functions for string operations.
+      template<class _CharT, class _Traits, class _Alloc>
+	void
+	_M_copy_from_string(const std::basic_string<_CharT,
+			    _Traits, _Alloc>& __s,
+			    size_t, size_t);
 
-    /**
-     *  @brief Sets every bit to false.
-    */
-    bitset<_Nb>&
-    reset()
-    {
-      this->_M_do_reset();
-      return *this;
-    }
+      template<class _CharT, class _Traits, class _Alloc>
+	void
+	_M_copy_to_string(std::basic_string<_CharT, _Traits, _Alloc>&) const;
 
-    /**
-     *  @brief Sets a given bit to false.
-     *  @param  position  The index of the bit.
-     *  @throw  std::out_of_range  If @a pos is bigger the size of the %set.
-     *
-     *  Same as writing @c set(pos,false).
-    */
-    bitset<_Nb>&
-    reset(size_t __position)
-    {
-      if (__position >= _Nb)
-	__throw_out_of_range(__N("bitset::reset"));
-      return _Unchecked_reset(__position);
-    }
+      /// Returns the number of bits which are set.
+      size_t
+      count() const
+      { return this->_M_do_count(); }
 
-    /**
-     *  @brief Toggles every bit to its opposite value.
-    */
-    bitset<_Nb>&
-    flip()
-    {
-      this->_M_do_flip();
-      this->_M_do_sanitize();
-      return *this;
-    }
+      /// Returns the total number of bits.
+      size_t
+      size() const
+      { return _Nb; }
 
-    /**
-     *  @brief Toggles a given bit to its opposite value.
-     *  @param  position  The index of the bit.
-     *  @throw  std::out_of_range  If @a pos is bigger the size of the %set.
-    */
-    bitset<_Nb>&
-    flip(size_t __position)
-    {
-      if (__position >= _Nb)
-	__throw_out_of_range(__N("bitset::flip"));
-      return _Unchecked_flip(__position);
-    }
+      //@{
+      /// These comparisons for equality/inequality are, well, @e bitwise.
+      bool
+      operator==(const bitset<_Nb>& __rhs) const
+      { return this->_M_is_equal(__rhs); }
 
-    /// See the no-argument flip().
-    bitset<_Nb>
-    operator~() const { return bitset<_Nb>(*this).flip(); }
-
-    //@{
-    /**
-     *  @brief  Array-indexing support.
-     *  @param  position  Index into the %bitset.
-     *  @return  A bool for a 'const %bitset'.  For non-const bitsets, an
-     *           instance of the reference proxy class.
-     *  @note  These operators do no range checking and throw no exceptions,
-     *         as required by DR 11 to the standard.
-     *
-     *  @if maint
-     *  _GLIBCXX_RESOLVE_LIB_DEFECTS Note that this implementation already
-     *  resolves DR 11 (items 1 and 2), but does not do the range-checking
-     *  required by that DR's resolution.  -pme
-     *  The DR has since been changed:  range-checking is a precondition
-     *  (users' responsibility), and these functions must not throw.  -pme
-     *  @endif
-    */
-    reference
-    operator[](size_t __position) { return reference(*this,__position); }
-
-    bool
-    operator[](size_t __position) const { return _Unchecked_test(__position); }
-    //@}
-
-    /**
-     *  @brief Retuns a numerical interpretation of the %bitset.
-     *  @return  The integral equivalent of the bits.
-     *  @throw  std::overflow_error  If there are too many bits to be
-     *                               represented in an @c unsigned @c long.
-    */
-    unsigned long
-    to_ulong() const { return this->_M_do_to_ulong(); }
-
-    /**
-     *  @brief Retuns a character interpretation of the %bitset.
-     *  @return  The string equivalent of the bits.
-     *
-     *  Note the ordering of the bits:  decreasing character positions
-     *  correspond to increasing bit positions (see the main class notes for
-     *  an example).
-     *
-     *  Also note that you must specify the string's template parameters
-     *  explicitly.  Given a bitset @c bs and a string @s:
-     *  @code
-     *     s = bs.to_string<char,char_traits<char>,allocator<char> >();
-     *  @endcode
-    */
-    template<class _CharT, class _Traits, class _Alloc>
-      basic_string<_CharT, _Traits, _Alloc>
-      to_string() const
+      bool
+      operator!=(const bitset<_Nb>& __rhs) const
+      { return !this->_M_is_equal(__rhs); }
+      //@}
+      
+      /**
+       *  @brief Tests the value of a bit.
+       *  @param  position  The index of a bit.
+       *  @return  The value at @a pos.
+       *  @throw  std::out_of_range  If @a pos is bigger the size of the %set.
+       */
+      bool
+      test(size_t __position) const
       {
-	basic_string<_CharT, _Traits, _Alloc> __result;
-	_M_copy_to_string(__result);
-	return __result;
+	if (__position >= _Nb)
+	  __throw_out_of_range(__N("bitset::test"));
+	return _Unchecked_test(__position);
       }
+      
+      /**
+       *  @brief Tests whether any of the bits are on.
+       *  @return  True if at least one bit is set.
+       */
+      bool
+      any() const
+      { return this->_M_is_any(); }
 
-    // Helper functions for string operations.
-    template<class _CharT, class _Traits, class _Alloc>
-      void
-      _M_copy_from_string(const basic_string<_CharT,_Traits,_Alloc>& __s,
-                          size_t, size_t);
-
-    template<class _CharT, class _Traits, class _Alloc>
-      void
-      _M_copy_to_string(basic_string<_CharT,_Traits,_Alloc>&) const;
-
-    /// Returns the number of bits which are set.
-    size_t
-    count() const { return this->_M_do_count(); }
-
-    /// Returns the total number of bits.
-    size_t
-    size() const { return _Nb; }
-
-    //@{
-    /// These comparisons for equality/inequality are, well, @e bitwise.
-    bool
-    operator==(const bitset<_Nb>& __rhs) const
-    { return this->_M_is_equal(__rhs); }
-
-    bool
-    operator!=(const bitset<_Nb>& __rhs) const
-    { return !this->_M_is_equal(__rhs); }
-    //@}
-
-    /**
-     *  @brief Tests the value of a bit.
-     *  @param  position  The index of a bit.
-     *  @return  The value at @a pos.
-     *  @throw  std::out_of_range  If @a pos is bigger the size of the %set.
-    */
-    bool
-    test(size_t __position) const
-    {
-      if (__position >= _Nb)
-	__throw_out_of_range(__N("bitset::test"));
-      return _Unchecked_test(__position);
-    }
-
-    /**
-     *  @brief Tests whether any of the bits are on.
-     *  @return  True if at least one bit is set.
-    */
-    bool
-    any() const { return this->_M_is_any(); }
-
-    /**
-     *  @brief Tests whether any of the bits are on.
-     *  @return  True if none of the bits are set.
-    */
-    bool
-    none() const { return !this->_M_is_any(); }
-
-    //@{
-    /// Self-explanatory.
-    bitset<_Nb>
-    operator<<(size_t __position) const
-    { return bitset<_Nb>(*this) <<= __position; }
-
-    bitset<_Nb>
-    operator>>(size_t __position) const
-    { return bitset<_Nb>(*this) >>= __position; }
-    //@}
-
-    /**
-     *  @brief  Finds the index of the first "on" bit.
-     *  @return  The index of the first bit set, or size() if not found.
-     *  @ingroup SGIextensions
-     *  @sa  _Find_next
-    */
-    size_t
-    _Find_first() const
-    { return this->_M_do_find_first(_Nb); }
-
-    /**
-     *  @brief  Finds the index of the next "on" bit after prev.
-     *  @return  The index of the next bit set, or size() if not found.
-     *  @param  prev  Where to start searching.
-     *  @ingroup SGIextensions
-     *  @sa  _Find_first
-    */
-    size_t
-    _Find_next(size_t __prev ) const
-    { return this->_M_do_find_next(__prev, _Nb); }
-  };
+      /**
+       *  @brief Tests whether any of the bits are on.
+       *  @return  True if none of the bits are set.
+       */
+      bool
+      none() const
+      { return !this->_M_is_any(); }
+
+      //@{
+      /// Self-explanatory.
+      bitset<_Nb>
+      operator<<(size_t __position) const
+      { return bitset<_Nb>(*this) <<= __position; }
+
+      bitset<_Nb>
+      operator>>(size_t __position) const
+      { return bitset<_Nb>(*this) >>= __position; }
+      //@}
+      
+      /**
+       *  @brief  Finds the index of the first "on" bit.
+       *  @return  The index of the first bit set, or size() if not found.
+       *  @ingroup SGIextensions
+       *  @sa  _Find_next
+       */
+      size_t
+      _Find_first() const
+      { return this->_M_do_find_first(_Nb); }
+
+      /**
+       *  @brief  Finds the index of the next "on" bit after prev.
+       *  @return  The index of the next bit set, or size() if not found.
+       *  @param  prev  Where to start searching.
+       *  @ingroup SGIextensions
+       *  @sa  _Find_first
+       */
+      size_t
+      _Find_next(size_t __prev ) const
+      { return this->_M_do_find_next(__prev, _Nb); }
+    };
 
   // Definitions of non-inline member functions.
   template<size_t _Nb>
     template<class _CharT, class _Traits, class _Alloc>
-    void
-    bitset<_Nb>::_M_copy_from_string(const basic_string<_CharT, _Traits,
-				     _Alloc>& __s, size_t __pos, size_t __n)
-    {
-      reset();
-      const size_t __nbits = std::min(_Nb, std::min(__n, __s.size() - __pos));
-      for (size_t __i = 0; __i < __nbits; ++__i)
-	{
-	  switch(__s[__pos + __nbits - __i - 1])
-	    {
-	    case '0':
-	      break;
-	    case '1':
-	      set(__i);
-	      break;
-	    default:
-	      __throw_invalid_argument(__N("bitset::_M_copy_from_string"));
-	    }
-	}
-    }
+      void
+      bitset<_Nb>::
+      _M_copy_from_string(const std::basic_string<_CharT, _Traits,
+			  _Alloc>& __s, size_t __pos, size_t __n)
+      {
+	reset();
+	const size_t __nbits = std::min(_Nb, std::min(__n, __s.size() - __pos));
+	for (size_t __i = __nbits; __i > 0; --__i)
+	  {
+	    switch(__s[__pos + __nbits - __i])
+	      {
+	      case '0':
+		break;
+	      case '1':
+		_Unchecked_set(__i - 1);
+		break;
+	      default:
+		__throw_invalid_argument(__N("bitset::_M_copy_from_string"));
+	      }
+	  }
+      }
 
   template<size_t _Nb>
     template<class _CharT, class _Traits, class _Alloc>
-    void
-    bitset<_Nb>::_M_copy_to_string(basic_string<_CharT, _Traits,
-				   _Alloc>& __s) const
-    {
-      __s.assign(_Nb, '0');
-      for (size_t __i = 0; __i < _Nb; ++__i)
-	if (_Unchecked_test(__i))
-	  __s[_Nb - 1 - __i] = '1';
-    }
+      void
+      bitset<_Nb>::
+      _M_copy_to_string(std::basic_string<_CharT, _Traits, _Alloc>& __s) const
+      {
+	__s.assign(_Nb, '0');
+	for (size_t __i = _Nb; __i > 0; --__i)
+	  if (_Unchecked_test(__i - 1))
+	    __s[_Nb - __i] = '1';
+      }
 
   // 23.3.5.3 bitset operations:
   //@{
@@ -1151,15 +1226,15 @@ namespace _GLIBCXX_STD
    *  hold.
   */
   template<class _CharT, class _Traits, size_t _Nb>
-    basic_istream<_CharT, _Traits>&
-    operator>>(basic_istream<_CharT, _Traits>& __is, bitset<_Nb>& __x)
+    std::basic_istream<_CharT, _Traits>&
+    operator>>(std::basic_istream<_CharT, _Traits>& __is, bitset<_Nb>& __x)
     {
       typedef typename _Traits::char_type char_type;
-      basic_string<_CharT, _Traits> __tmp;
+      std::basic_string<_CharT, _Traits> __tmp;
       __tmp.reserve(_Nb);
 
-      ios_base::iostate __state = ios_base::goodbit;
-      typename basic_istream<_CharT, _Traits>::sentry __sentry(__is);
+      std::ios_base::iostate __state = std::ios_base::goodbit;
+      typename std::basic_istream<_CharT, _Traits>::sentry __sentry(__is);
       if (__sentry)
 	{
 	  try
@@ -1169,19 +1244,19 @@ namespace _GLIBCXX_STD
 	      // 303. Bitset input operator underspecified
 	      const char_type __zero = __is.widen('0');
 	      const char_type __one = __is.widen('1');
-	      for (size_t __i = 0; __i < _Nb; ++__i)
+	      for (size_t __i = _Nb; __i > 0; --__i)
 		{
 		  static typename _Traits::int_type __eof = _Traits::eof();
 		  
 		  typename _Traits::int_type __c1 = __buf->sbumpc();
 		  if (_Traits::eq_int_type(__c1, __eof))
 		    {
-		      __state |= ios_base::eofbit;
+		      __state |= std::ios_base::eofbit;
 		      break;
 		    }
 		  else
 		    {
-		      char_type __c2 = _Traits::to_char_type(__c1);
+		      const char_type __c2 = _Traits::to_char_type(__c1);
 		      if (__c2 == __zero)
 			__tmp.push_back('0');
 		      else if (__c2 == __one)
@@ -1189,18 +1264,18 @@ namespace _GLIBCXX_STD
 		      else if (_Traits::eq_int_type(__buf->sputbackc(__c2),
 						    __eof))
 			{
-			  __state |= ios_base::failbit;
+			  __state |= std::ios_base::failbit;
 			  break;
 			}
 		    }
 		}
 	    }
 	  catch(...)
-	    { __is._M_setstate(ios_base::badbit); }
+	    { __is._M_setstate(std::ios_base::badbit); }
 	}
 
       if (__tmp.empty() && _Nb)
-	__state |= ios_base::failbit;
+	__state |= std::ios_base::failbit;
       else
 	__x._M_copy_from_string(__tmp, static_cast<size_t>(0), _Nb);
       if (__state)
@@ -1209,15 +1284,55 @@ namespace _GLIBCXX_STD
     }
 
   template <class _CharT, class _Traits, size_t _Nb>
-    basic_ostream<_CharT, _Traits>&
-    operator<<(basic_ostream<_CharT, _Traits>& __os, const bitset<_Nb>& __x)
+    std::basic_ostream<_CharT, _Traits>&
+    operator<<(std::basic_ostream<_CharT, _Traits>& __os,
+	       const bitset<_Nb>& __x)
     {
-      basic_string<_CharT, _Traits> __tmp;
+      std::basic_string<_CharT, _Traits> __tmp;
       __x._M_copy_to_string(__tmp);
       return __os << __tmp;
     }
+
+  // Specializations for zero-sized bitsets, to avoid "unsigned comparison
+  // with zero" warnings.
+  template<>
+    inline bitset<0>&
+    bitset<0>::
+    set(size_t, bool)
+    {
+      __throw_out_of_range(__N("bitset::set"));
+      return *this;
+    }
+      
+  template<>
+    inline bitset<0>&
+    bitset<0>::
+    reset(size_t)
+    {
+      __throw_out_of_range(__N("bitset::reset"));
+      return *this;
+    }
+      
+  template<>
+    inline bitset<0>&
+    bitset<0>::
+    flip(size_t)
+    {
+      __throw_out_of_range(__N("bitset::flip"));
+      return *this;
+    }
+      
+  template<>
+    inline bool
+    bitset<0>::
+    test(size_t) const
+    {
+      __throw_out_of_range(__N("bitset::test"));
+      return false;
+    }
   //@}
-} // namespace std
+
+_GLIBCXX_END_NESTED_NAMESPACE
 
 #undef _GLIBCXX_BITSET_WORDS
 #undef _GLIBCXX_BITSET_BITS_PER_WORD